Omron VARISPEED E7 User Manual page 233

Loopback Test
The loopback test returns command messages directly as response messages without changing the contents to
check the communications between the master and slave. A user-defined test code and data values can be set.
The following table shows a message example when performing a loopback test with the slave no. 1.
Command Message
Slave address
Function code
Test Code
Data
CRC-16
Writing to Multiple Inverter Memory Registers
The writing of inverter memory registers works similar to the reading process, i.e. the address of the first reg-
ister that is to be written and the quantity of to be written registers must be set in the command message.
The to be written data must be consecutive, starting from the specified address in the command message. The
data order must be higher 8 bits, then lower 8 bits. The data must be in memory register address order.
The following table shows an example of a message where a forward operation has been set with a frequency
reference of 60.0 Hz for the inverter with the slave address 01H.
Command Message
Slave Address
Function Code
Start
Address
Quantity
No. of data
Lead data
Next data
CRC-16
IMPORTANT
6-76
(During Normal Operation)
01H Slave address
08H Function code
Higher 00H
Test Code
Lower 00H
Higher A5H
Data
Lower 37H
Higher DAH
CRC-16
Lower 8DH
(During Normal Operation)
01H Slave Address
10H Function Code
Higher 00H
Start
Address
Lower 01H
Higher 00H
Quantity
Lower 02H
04H
CRC-16
Higher 00H
Lower 01H
Higher 02H
Lower 58H
Higher 63H
Lower 39H
For the number of data value in the command message the double value of the data quantity must be
used.
Response Message
01H
08H
Higher 00H
Lower 00H
Higher A5H
Lower 37H
Higher DAH
Lower 8DH
Response Message
01H
10H
Higher 00H
Lower 01H
Higher 00H
Lower 02H
Higher 10H
Lower 08H
* No. of data = 2 x (quantity)
Response Message
(During Error)
Slave address 01H
Function code 89H
Error Code 01H
Higher 86H
CRC-16
Lower 50H
Response Message
(During Error)
Slave Address 01H
Function Code 90H
Error code 02H
Higher CDH
CRC-16
Lower C1H